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Handling editor Ellen J Weber
Contributors T-NL wrote the manuscript and prepared the images. C-HC revised the manuscript and prepared the images. S-CC obtained patient consent and wrote the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting or dissemination plans of this research.
Provenance and peer review Not commissioned; internally peer reviewed.
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